Daniel deawbaugh



(No Model.)

' D. DRAWBAUGH.

INDUCTION 0011..

No. 344,818. Patented July 6, 1886.

IT'NESSES: Q M

INVENTOR ml}, MMQA L BY ATTORNEYS UNITED STATES PATENT OFFICE.

DANIEL DRAVBAUGH, OF EBERLYS MILL, PENNSYLVANIA, ASSIGNOR TO THE IEOPLES TELEPHONE COMPANY, OF NEW YORK, N. Y.

INDUCTION-COIL.

SFEGTEICATION forming part of Letters Patent No. 344,818, dated July 6, 1886.

Application filed November 12, 1853.

To all whom, it may concern:

Be it known that I, DANIEL DRAWBAUGH, of Eberlys Mill, Cumberland county, Pennsylvania, have invented a new and useful Improvement in Induction-0oils, of which the following is a specification.

The invention relates to an improved form ofinduction-coil, adapted for use in telephones and other apparatus, that are often made of such a shape that the limited space necessitates the coil being constructed of long and narrow form, in order to obtain the desired induction effect. It is well known, however, that the induced currents in a long narrow induction-coil having a single continuous core are not reversed quickly and sharply, and hence that such a coil is ill adapted for telephonic purposes.

My present invention consists in an induction-coil of the aforesaid shape, which is exceedingly sensitive, and which is especially well suited for telephonic use.

In the drawings hereto annexed I show my induction-coil arranged in a telephone, the instrument being of a form necessitating a coil of this shape, in order to obtain the best results from its use as a telephone-transmitter.

The invention consists,more particularly,in an inductioircoil having a core transversely divided into two or more sections, or, in other words, containing a number of short cores placed end to end, pieces of non-inductive ma terial being arranged between the ends of the cores or core-sections.

In the accompanying drawings, Figure l is a front view of a telephone-transmitter containing my improved induction-coil, the diaphragm of said transmitter being removed, in order to show the internal arrangement. Fig. 2 is a vertical section on the line :0 m of Fig. 1. Fig. 3 is an enlarged partial longitudinal section of the induetion-coil.

Similar letters of reference indicate like parts.

The induction-coil is shown at J, Figs. 1 and 2.

Referring more particularly to Fig. 3, A B O is the divided core or series of cores, and D Serial No. 111,546. (No model.)

and E are pieces of non-inductive material placed between the ends of said core. I is the primary coil surrounding said core, and F is the secondary coil. G and II are the heads or flanges. J and K are the terminals of the primary coil, and J and K the termiv nals of the secondary coil.

The particular construction of telephonetransmitter here shown, the conformation and arrangement of the case and of the electrodes, and, generally, all other parts and portions of the apparatus excepting the induction-coil, which specifically forms the object of this application, are herein diselaimed, the said parts and their various combinations and arrangement having already been fully described and claimed by me in other applications already filed,or to be filed simultaneously herewith.

Referring to Figs. 1 and 2, which show my improved form of induction-coil applied to a telephonetransmitter, I? is the box or case of the instrument, having a hollow or recess to receive the coil J. K is the cover; L, the dia phragm; M and N, the carbon electrodes; 0, a metal rod supporting the electrode M, the said rod resting upon and being supported by the spring R. The circuits in the instrument proceed as follows: From the battery tothe binding-post 1, to the primary I of the induction-coil J, to a contact-piece, Q, to a contact piece on the diaphragm, and thence by a wire (these parts not being shown) to the electrodes N and M, to the rod 0, to the spring 1%, to the binding-post 2, and thence to the battery. The secondary wire F of the induction-coil proceeds to the line by the binding-posts 3 and 4, from which posts extend wires to the binding-posts 5 and 6, to which a receiving-instrument may be attached.

The operation of the instrument is fully set forth in the other applications above referred to, and is therefore not here explained.

I claim as my invention 1. An induction-coil having two or more cores or core-sections placed end to end, and not in contact, substantially as described.

2. An induction-coil having two or more cores or core-sections placed end to end, and

having interposed pieces of non inductive the primary and secondary coils, substantially material arranged between the proximate ends as described.

ggggres or core-sections, substantially as D ANIE-L DRAWBAUGH 5 3. In an induction-coil, the combination of Witnesses:

the cores or core-sections A B G, the interposed FRED. M. OTT,

pieces of non-inductive material, D and E,and M. W. J AO0Bs.- 

